17. 17. Bar diameter for external threads (for cutting type dies)

■Sewing machine screw threads (for 2nd class)

■ Unit : mm major diameter of external threads bar diameter Size

d max d min dmax dmin (ref.)

P dmax dmin T dmax dmin T No.0-80UNF 1.511 1.431 1.45

d d 1/16 SM 80 1.588 1.518 1.54

4.541.93741.4370.50041.93041.6100.320No.1-64UNC1.8381.7431.77
441.94041.4650.47541.94041.4650.475No.1-72UNF1.8381.7511.775/ 64 SM 641.9841.9041.92
M42341.95241.5770.37541.95241.5770.375No.2-56UNC2.1692.0662.093/32 SM 562.3812.2862.31
241.96241.6820.28041.94041.6400.300No.2-64UNF2.1692.0732.10SM 1002.3812.3062.32

3/32

1.541.96841.7320.23641.95041.7800.170No.3-48UNC2.4962.3832.41
4.544.93744.4370.50044.93044.6100.320No.3-56UNF2.4962.3932.421/8 SM 403.1753.0453.08
444.94044.4650.47544.94044.4650.475No.4-40UNC2.8242.6952.731/8 SM 443.1753.0553.09
M45344.95244.5770.37544.95244.5770.375No.4-48UNF2.8272.7132.743.4423.47

9/ 64 SM 40 3.572

244.96244.6820.28044.94044.6400.300No.5-40UNC3.1543.0263.06
1.544.96844.7320.23644.95044.7800.170No.5-44UNF3.1573.0363.0711/ 64 SM 404.3664.2364.27
547.92947.3990.53047.93047.5900.340No.6-32UNC3.4843.3333.373/SM 244.7624.6024.64

16

4 47.940 47.465 0.475 47.940 47.465 0.475 No.6-40UNF 3.484 3.356 3.39

3/16 SM 28 4.762 4.602 4.64

M48347.95247.5770.37547.95247.5770.375No.8-32UNC4.1423.9914.03
247.96247.6820.28047.94047.6400.300No.8-36UNF4.1454.0064.043/16 SM 324.7624.6024.64
1.547.96847.7320.23647.95047.7800.170No.10-24UNC4.8004.6184.667/SM 325.5565.3965.44

32

No.10-32UNF 4.803 4.651 4.69

15/ 64 SM 28 5.953 5.773 5.82

No.12-24UNC5.4615.2795.32
No.12-28UNF5.4615.2965.341/4 SM 246.3506.1706.22
1/4-20UNC6.3226.1176.171/SM 406.3506.2206.25

4

1/4-28UNF 6.324 6.160 6.20

・from table 2 JIS B 0226 (void in 2001)

5/16-18UNC7.9077.6877.74
5/16-24UNF7.9097.7277.77
3/8-16UNC9.4919.2549.31
3/8-24UNF9.4979.3159.36
7/16-14UNC11.07610.81610.88Taper pipe threads (PT, R)Parallel pipe threads (PF · G)(for A class)

Unit : mm Unit : mm

7/16-20UNF 11.079 10.874 10.93

bar diameter (ref.) major diameter of external threads bar diameter

1/2-13UNC 12.611 12.386 12.4 Size Size

dmax dmin (ref.)

1/2-20UNF 12.666 12.462 12.5 taper (dia of thread end) Straight

PT 1/16 - 28 7.5 7.9 PF 1/16 - 28 7.723 7.509 7.56

9/16-12UNC 14.246 13.958 14.0

9/16-18UNF14.25114.03114.1PT1/ 8 - 289.59.9PF1/8 - 289.7289.5149.57
5/8-11UNC15.83415.52815.6PT1/- 1912.813.4PF1/- 1913.15712.90713.0

4 4

5/8-18UNF 15.839 15.619 15.7

3/4-10UNC19.00418.67718.8PT3/ 8 - 1916.316.9PF3/8 - 1916.66216.41216.5
3/4-16UNF19.01118.77418.8PT1/2 - 1420.521.3PF1/2 - 1420.95520.67120.7
7/8-9UNC22.17621.82421.9PT3/- 1425.926.8PF5/- 1422.91122.62722.7

4 8

7/8-14UNF 22.184 21.923 22.0

25.349 24.969 25.1 PT 1 - 11 32.7 33.7 PF 3/4 - 14 26.441 26.157 26.2

1-8UNC

1-12UNF25.35425.06525.1PT 1 1/4 - 1141.242.3PF7/8 - 1430.20129.91730.0
1 1/8-7UNC28.51928.10328.2PT 1 1/- 1147.148.2PF1 - 1133.24932.88933.0

2

1 1/8-12UNF 28.529 28.240 28.3

1 1/4-7UNC31.69431.27831.4PT2 - 1158.760.1PF 1 1/8 - 1137.89737.53737.6
1 1/4-12UNF31.70431.41531.5PF 1 1/4 - 1141.91041.55041.6
1 3/8-6UNC34.86434.40234.5PF 1 1/- 1147.80347.44347.5

2

1 3/8-12UNF34.87634.58834.7
1 1/2-6UNC38.03937.57737.7PF2 - 1159.61459.25459.3
1 1/2-12UNF38.05137.76337.8
1 3/4-5UNC44.38143.86144.0
2-4.5UNC50.72650.16850.3